<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="text" name="" id="">
    <script>
        let inp = document.querySelector('input');

        inp.onkeyup = function(){
            // console.log(this.value);
            console.log(this.value.trim());
            console.log(this.value.trimStart());
            console.log(this.value.trimEnd());
        }

    </script>
</body>
</html>